US3733337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamino-xanthene(or thioxanthene)spirodibenzopyranes
Assignee: Novartis AG
•
Filing: 1970-12-16
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Granted: 1973-05-15
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Expires: 1990-12-16
Abstract
Abstract A 3'',6''-DIAMINO-XANTHENO (OR THIOXANTHENO)-9''-SPIRO6-DIBENZO-(B,D)-PYRANE COMPOUND OF GENERAL FORMULA 1 X<(-(4-Z,5-(Y1-N(-Y2)-)1,2-PHENYLENE)-C<(-(1,2-PHENYLENE)- (1,2-PHENYLENE)-O-)-(4-(Y1-N(-Y2)-),5-Z-1,2-PHENYLENE)-) WHEREIN X REPRESENTS AN OXYGEN ATOM OR A SULPHUR ATOM, Y1 AND Y2, WHICH MAY BE THE SAME OR DIFFERENT, EACH REPRESENTS AN ALKYL OR ARYL RADICAL AND Z REPRESENTS A HYDROGEN ATOM OR AN ALKYL GROUP, AND WHEREIN THE BENZENE RINGS A AND B MAY CONTAN ALKYL GROUPS, HALOGEN ATOMS AND SULPHONIC ACID GROUPS AS SUBSTITUENTS.
Inventors
- 👤 H Balli
- 👤 U Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:47
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |